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Original question:

BQ24070: Running BQ24070 Devices in Parallel

BQ24070: can I use several BQ24070 connected in parallel having common output line to get more current?

Vlad ruz
Prodigy 20 points
Part Number: BQ24070
Other Parts Discussed in Thread: TPS61088

Hi. I'm going to build a system based on a RaspberryPi 3+ and powered fom AC-DC power supply. But I also want to have  an UPS for my system using 2-3 18650 cells + BQ24070 for each cell + TPS61088.

Can I use several BQ24070 connected in parallel? or you have more suitable IC for such "ideas"? Thank you.

  • 0
    TI__Mastermind 21590 points
    Hello Vlad,
    Why are you considering having the BQ24070 in parallel to charge the 18650 cells? Do you need faster charging with higher currents?
  • 0 in reply to Raheem
    Prodigy 20 points
    Hi Raheem
    No, charge current is not really important to me. The most important to me is to have high output current, because quick estimation gives 5A at short peaks. So I expect 3 Bq24070 is OK for my system. Moreover my system will have a copcessor that will have a lot of "responsibilities" including control of each cell, counting their capacity and alarming via I2C to RaspPi if any cell is degraded. I wish to have several cells to make my system more robust and I want to be able to control each cell
    What do you think? Should I change the concept and use another ICs with higher output current but with a single cell?
    Thank you.
  • 0 in reply to Vlad ruz
    TI__Mastermind 21590 points

    Vlad,
    We have high efficiency witching chargers that can charge at high currents. If it is possible to use a single battery with high capacity and high output current, you can use a single switching charger to charge it which would remove complexities with your design.